Damping device for railway car trucks



Jan. 27, 1953 C. L. ORR

DAMPING DEVICE FOR RAILWAY CAR TRUCKS Original Filed Aug. 26. 1947 4 Sheets-Sheet l Jan.f27, 1953 c. L. ORR 2, 7

DAMPING DEVICE FOR RAILWAY CAR TRUCKS Original Filed Aug. 26, 1947 4 Sheets-Sheet 2 U ll n! 27 MM/ Jan. 27, 1953 c. ORR

DAMPING DEVICE FOR RAILWAY CAR TRUCKS 4 Sheets-Sheet 3 Original Filed Aug. 26, 1947 awe/who'll Jan. 27, 1953 c. L. ORR

DAMPING DEVICE FOR RAILWAY CAR TRUCKS 4 Sheets-Sheet 4 Original Filed Aug. 26, 1947 FIG. 5

Patented Jan. 27, 1953 2 UNITED STATES PATENT OFFICE DAMT-ING DEVIGE FOR-RAILWAY rCAR TRUCKS (Handel. Orr, Columbus, Ohio, '"assignor to The "Buckeye Steel Castings Company, Columbus,

Ohio

Original application August I 26, 1947, "Serial No. 770,666. Divided and this applicationDecem- "her-9, 1948,'Serial'No. 64,373

6. Claims.

This invention relates to :damping .devices for railway *car trucks and more :particularly :to -means for producing constant damping independ- *ent-'ofthe load carried by the bolster orlbolsters ofsuch'trucks. "The present-application *is a I division of application, Serial-No. 170,666, filed August :26, 1947,

---n :rw abandoned.

One of the objects of the inventionis to provide a damping device including a vertical surface at "a side wall of thebolster, cooperatingwith a vertical friction surface of a wedge which has an inclined surface slidably engaging a complementary Surface of a guide column, the wedge being 'acted-upon'by a coil spring which-bears on a portion of the .side frame so as to produce constant damping of thebolster movements indescription proceeds, the invention consists in l the novel features hereinafter described in detail, illustrated in the accompanying drawings, and more,particularlypointed .out inth-e appended claims.

In the drawings; N

Fig. .1. is arside .elevationalviewof-a four-wheel truck provided with an embodimentof the invention.

.Fig. 2 is .an .enlargedfragmentary .view of a side frameof such a truck with parts shown in vertical section.

Fig. 3 .is a transverse vertical sectional view taken on the line 3 3.of 'Fig..2.

Fig. A is a ihorizontalsectional view taken on .the line .4-4 of Fig. '2.

Fig. is a sectional View .of .a detailitaken on theline 5-5..of Fig.2.

.Referring .to Figs. 1 to 5,..inclusive, a truss type .side frame 8 is provided with a bolster opening 9 .de'finedby a top member I0, spaced bolster guide columns I I, and a bottomor spring seat member 12. A bolster end l3 extends through the bolster opening and is supported on the seat 12 by coil springs l4. The'bolster end (Fig. 2) is provided with ahorizontallv disposed transverse bore t5.

preferably cylindrical, to receive a horizontally .slidable thrust member It. At each zendnt f l thrust 'memberis provided withan arcuate con- -.vex surface ll whichcooperates With-$411 {arcshaped concave surface I8, of a friction Shoe 19, -20. Thesecurvedsurfaces permit relativeatqcking movement between each :Sh0e andthe :thrust member in a vertical plane longitudinallymfzthe truck. Each .friction shqe provides La avertical friction. surface "2 I iationelsidelof theubolster.

-.At one ,side ofathe bolster opening, the'vertical surface :2 l 50f thezshoe I 9, bears :againstath ewerztical friction surface :22 of .a ,friction :wedge :23.

The wedge "provided with caninclined surface 24 which slidably engages an inclined plate L0 web 25 formed :by one. of .thebolsterlguideicolumns H. A wedge actuating resilient means, such *as a: spring or.coil:.2.6 ,.:is :positioned inithezcolumn at one end1of thezfr'ictionwedgeandis:arrangedwith its axis, parallel 'withztheinclined web :25. ;;At=-one .end, the wedge ;spring ibears:.againstxa seat -21 pIO- vided atione endiof tthe frictionwedge. I he-op- .posite end of .the coil spring bears against i'a :sprin seatmember 2 8 which-inwturnis. supported .on the inclined tension portion 29 .of the lower .=member .l-2 of theside-frame, by. means of a'screw :3t threadedzinto the inclined member, at -31, .and

.friction wedge V23Vinto contact Withthe friction shoe l9 and this pressure is transmitted by the horizontal thrust member It, to friction shoe 2B .and the guide column I l (having theiventicalrsurface 33). -.Relative-vertica1 movement between the bolster and side frame, due to oscillation .of

thebolstersupporting springs 4. is damped by the sliding frictional forces at the vertical surface 2! .of the friction shoes. .It is-also .evident "that the damping action is independent ;0f the load carried by the bolster-and that adequate "provision is made for rocking movementina ver- '.tical ;p1ane longitudinally of :theside frame -.bettweensaid frame-and the bolster end. ThiSEiDlfQ- vision desirable in four-wheel trucks because :of track irregularities, and particularly a-soin equalized types .of six "and eight-wheel :trucksin which the actionof thetequalizer-produces rocking -or tilting 0f the side 'lframes relative to :the

bolster. Although the drawings show a friction wedge and spring arranged at one side only of the bolster opening, it is evident that the arrangement can be made symmetrical, and a wedge and wedge spring can be placed at each side of the bolster opening if necessary or desirable.

To assemble the parts, the screw 3% is backed out of the threads in the inclined portion of the bottom or tension member to a lowered position, and spring seat 28, wedge spring 2% and friction wedge 23, are inserted in place from the upper portion of the bolster opening. Bolster end 13 with the thrust member l6 and friction shoes l9 and 20 in place, can then be applied in the usual manner through the lower portion 35 of the bloster opening and raised to the upper portion of such opening before the supporting springs it are applied. The bolster is then lowered onto the springs l4 and the assembly is completed by turning up screw 30 to produce the desired compression of wedge spring 26, after which the screw is locked by the nut 32. To dismantle the truck,

the reverse of the above precedure is followed.

ing device may be readily understood and it is manifest that changes may be made in the details disclosed Without departing from the spirit of the invention as expressed in the following claims.

What I claim and desire to secure by Letters Patent is:

1. A railway truck comprising a side frame having a bolster opening partially defined by opposed first and second guide columns, a bolster having an end portion extending into said opening, springs supporting the end portion of the bolster from the side frame, a thrust member -slidabletransversely within the bolster, friction shoe having articulate connection with the ends of the thrust member and provided with vertical z surfaces, thevertical surface of one of the shoes slidably engaging the first guide column, the second guide column having an inclined surface converging toward the vertical surface of the other shoe, a wedge having a vertical surface contacting the last-mentioned vertical surface, said wedge having an inclined surface contacting the inclined surface of the second column, and resilient means bearing against the wedge and side frame for yieldingly urging the wedge against the last-mentioned vertical surface of one of said shoes and the inclined surface of the guide column.

--2. A railwaytruck comprising a side frame having a bolster opening partially defined by opposed first and second guide columns, a bolster having an end portion extending into said opening, springs supporting the end portion of the bolster from the side frame, a thrust member slidable transversely within the bolster, friction shoes having articulate connection with the ends of the thrust member and provided with vertical surfaces, the vertical surface of one of the shoes slidably engaging the first guide column, the second guide column having an inclined surface converging toward the Vertical surface of the other shoe, a wedge having a vertical surface contacting the last-mentioned vertical surface, said wedge having an inclined surface contacting the inclined surface of the second column, resilient means bearing against the wedge and side frame for yieldingly urging the wedge against the lastmentioned vertical surface of one of said shoes and the inclined surface of the guide column, and means for adjusting the force exerted by said resilient means.

3. A railway truck comprising, a side frame having a bolster opening partially defined by opposed guide columns, a bolster having an end portion extending into said opening, springs supporting the end portion of the bolster on the side frame, a thrust member slidable transversely in the bolster, a shoe connected to one end of the thrust member, a substantially vertical surface on said shoe engaging one guide column, a shoe connected to the other end of the thrust member, a substantially vertical surface on the second shoe, a wedge having a substantially vertical surface contacting the vertical surface on the second shoe, an inclined surface on the second guide column converging towards the vertical surface on the second shoe, an inclined surface on the wedge contacting the inclined surface of the second guide column, and resilient means bearing against the wedge and the side frame urging the wedge against the vertical surface on the second shoe and the inclined surface of the second guide column.

4. In a railway truck, a side frame having a bolster openin guide columns defining the sides of said bolster opening, a bolster having an end portion extending into said opening, springs sup porting the end portion of the bolster on the side frame, an elongated thrust member slidable transversely in the bolster, a convex surface at one end of the thrust member, a shoe having a concave pocket receiving the convex end of the thrust member, a vertical surface on said shoe engaging one guide column, a convex surface at the other end of the thrust member, a second shoe having a concave pocket therein receiving the second convex end of the thrust member, a vertical surface on the second shoe, a wedge having a vertical surface contacting the vertical surface on the second shoe, an inclined surface on the second guide column converging towards the vertical surface on the second shoe, an inclined surface on the wedge engaging the inclined surface on the second guide column, and a spring compressed between said wedge and theside frame urging the wedge against the vertical surface on the second shoe and the inclined surface on the second guide column. 7

5. A railway truck comprising, a side frame having a bolster opening partially defined by opposed guide columns, a bolster having an end portion extending into said opening, springs supporting the end portion of the bolster on the side frame, a thrust member slidable transversely'in the bolster, a shoe bearing against one end of the thrust member, a substantially vertical surface on said shoe engaging one guide column, a

' shoe bearing against the other end of the thrust member, a substantially vertical surface on the second shoe, a wedge having a substantially vertical surface contacting the vertical surface on the second shoe, an inclined surface on thesecond guide column converging towards the vertical surface on thesecond shoe, an inclined surface on the wedge contacting the inclined surfaceof 5 shoe and the inclined surface of the second guide column.

6. A railway truck comprising, a side frame having a bolster opening partially defined by opposed guide columns, a bolster having an end portion extending into said opening, springs supporting the end portion of the bolster on the side frame, a'thrust member slidable transversely in the bolster, a shoe bearing on one end of the thrust-member, a substantially vertical surface on said shoe engaging one guide column, a shoe bearing on the other end of the thrust member, a substantially vertical surface on the second shoe, a wedge having a substantially vertical surface contacting the vertical surface on the second shoe, an inclined surface on the second guide column converging towards the vertical surface on the second shoe, an inclined surface on the wedge contacting the inclined surface of the second guide column, a coil spring having one end thereof abutting against the wedge, a spring seat mem- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 22,867 Dath Apr. 15, 1947 2,159,138 Duryea May 23, 1939 2,180,900 Goodwin Nov. 21, 1939 2,352,693 Davidson July 4, 1944 20 2,422,638 Tucker June 17, 1947 

